Elevating jack



Apr., l0, 1923 1,451,661

J. G. cRocKETT ELEVATING JACK Filed Nv. 25, 1921 lll/41111111111111111111flllllllllml//lllflll wwn Patented Apr. 10, 1923.

JESSE G. CROCKETT, OF WINNEBAGO, NEBRASKA, ASSGNOR T0 SLOAN-CROCKET'I CO., 0F SIOUX CTY, IOWA.

ELEVATING JACK.

Application med November 25, 1921.

To all fio/0m t may concern.'

Be it known that I, JESSE G. CROCKETT, citizen of the United States, residing at lVinnebago, in the county of Thurston and State of Nebraska, have invented certain new and useful Improvements in Elevating Jacks, of which the following is a speciiication.

rlfhe invention has reference to elevating jacks and particularly to a jack of the screw type wherein the elevating power is concentrated at the center of the device which makes the same more lirm and stable.

An additional object is to provide a jack in which the load-sustaining member is adapted to be adjusted vertically through the medium of an operating handle movable in a horizontal plane, the said handle being hingedly mounted so that it can be brought to a noneoperating position when the jack is not in use.

Another object is to provide a jack of the character above specified comprising but a few parts which, however, are so associated as to permit the convenient dismantling of the jack into its component parts whereby the same can be readily stored away.

Various other objects and advantagesor1 the invention will become apparent during the continuance of the following description.

In the i drawings Figure 1 is a top plan view of the improved jack.

Figure 2 is a side View thereof, partly in elevation and partly in section to illustrate the construction, and,

Figure 3 is an enlarged and detailed view of operating end of the handle.

The jack may be constructed of any suitable material suificient for the purpose and as shown embodying a substantial base 10 having a vertical standard 11 integral therewith. Thisystandard is provided with a longitudinally extending central bore 12 opening inwardly from the upper end to receive and accommodate the elongated screw shank 13 of the load sustaining member. This member is threaded throughout its length, as indicated at 14, and carries at its upper end a load-rest 15 having a collar 16 encircling the upper end of shank and fastened thereto by any suitable means as indicated at 17.

Standard 11 is provided with an enlargement or bead 18 at its upper end to suitably support a horizontally disposed cog-gear 19,

Serial No. 517,589.

the latter being of a relatively large diarneter and overhanging the standard as shown. The upper face oiz the bead is made smooth and even where it contacts with the gear so as to provide a suitable bearing` surface forthe latter, as indicated at 20. L)

Gear 19 is provided with a central opening 21 threaded to correspond to the threads ot screw 13 so that rotary movement of the gear will cause the screw, which is inserted through the gear, to be adjusted vertically o f the jack in either an up or down direction.

'lo operate the jack, a handle 21 is provided. Hingedly connected to one end of the handle, as at 22, is one end of a supporting bracket 23, the opposite end of the bracket being' provided with a hook 24 as shown. This bracket provides means tor supporting the handle in place and is accordingly provided with an opening 25 intermediate the ends of the body portion and having a smooth bore, this opening being adapted to permit the insertion of screw 13 therethrough as shown to advantage in Figure 2 of the drawings.

Depending from the under side of the handle, adjacent the hinge is a lug 26 for engagement with the notches or spaces between the teeth 27 of cog-gear 19. When the parts are assembled as shown in Figure 2, the hook end of the handle-bracket extends under the cog-gear on one side while the body portion extends across the top of the gear, this arrangement tending to prevent any vertical displacement of the bracket when handle 21 is in an inoperative position.

When operating the jack, handle 21 is swung to either right or left, rotating gear 19, it being understood that lug 26 engages the notch only when the handle is in a horizontal position as shown. Rotation of the gear causes the load-sustaining member to be adjusted vertically in either an up or down direction according to the way the threads run and the direction in which handle 21 is moved. Since the adjustment of the load-sustaining member is obtained through the engagement of the threads of the gear and screw shank and since this engagement takes place at the central openin of the gear, it will be seen that the lifting power is concentrated at a central point in the device which is thereby rendered more stable and balanced during the lifting operllO Since the screw 13 and the gear 19 are mue tually interlocked by means of their threaded engagement and gear 19, is, in turn, interlocked with the bracket of the handle, it will be seen that all three members constitute a single unit which may be removed bodily lfrom association with standard 11 in the dismantling of the device. And by unscrewing the shank from the gear and disengaging the handle bracket. from the gear, the unit may be resolved into its several parts and stored away with the jack base 'and standard, occupying but a small amount of space.

From the foregoing it is believed that `the advantages and novel features of my invention will be readily understood ,and therefore further detailed description is deemed unnecessary.

, What is claimed is l. A jack comprising ha hollow vertical standard provided with a bearing surface at its upper open end, a horizontally disposed gear overhanging said open end of said standard and having a bearing on the said bearinr surface thereof, said gear having a centrala threaded opening, a screw adjustable through the opening of said gear and having ,a load-rest at its upper ,end beyond the gear, a bracket disposed crosswise of said gear and having a central opening for the ypassage of the said screw therethrough, said vertical standard providedwith a supporting surface at its upper open end, a hori- Zntally ,disposed gear disposed over the said open end ofthe said standard and having a bearing on the said bearing surface thereof. ascrew adjustable thru a central opening in the said gear and having a load-rest at its uppery end beyond the gear, and means for vrotating the said gear to `adjust the said screw, said gear-rotating means including a handle bracket embracing the said gear to prevent vertical displacement of the bracket when the rotating means is in. inoperative position.

In testimony whereof I affix my signature.

JESSE e. cnocKErr. 

